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Investigation on Micro-Structure Evolution of Mg-12Gd-3Y-0.5Zr Magnesium Alloy under High Velocity Impact

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Abstract:

Cubic-shaped specimens and hat-shaped specimens were used to investigate ASBs formed in Mg-12Gd-3Y-0.5Zr magnesium alloy under different initial strain rate impact. It shows that no adiabatic shear bands (ASBs) is observed in micro-structure of cubic-shaped specimens by scanning electron microscope (SEM) , but obvious ASBs can be observed in hat-shaped specimens. Johnson-Cook model based on thermoviscoplasticity constitutive relation was used to simulate internal stress distribution and fracture mode, and it indicated that the result of failure analysis from specimens under high velocity impact tests was the same as that obtained by computer simulation.

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Periodical:

Advanced Materials Research (Volume 997)

Pages:

325-331

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.997.325

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Online since:

August 2014

Authors:

Xiao Ming Yang*

Keywords:

Adiabatic Shear Band (ASB), High Velocity Impact, Microstructure, Split-Hopkinson Pressure Bar (SHPB)

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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